The platform-independent aircraft simulation environment at Manned Flight Simulator

Nichols, James H.; Magyar, Thomas; Schug, Eric C.

doi:10.2514/6.1998-4179

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…The whole airframe was made compatible with CASTLE (Control Analysis and Simulation Test Loop Environment). CAS-TLE is a 6-degree-of-freedom non-linear aircraft simulation architecture developed by Naval Air Warfare Center's Manned Flight Simulator branch (MFS) [11]. The CASTLE structure is implemented on the Virgina Tech modified 2F122A motion-based flight simulator.…”

Section: Naval Air Systems Command Provided the Original F/a-18 Simulmentioning

confidence: 99%

Comparison of Two Methods Used to Deal with Saturation of Multiple, Redundant Aircraft Control Effectors

Nelson

2002

AIAA Atmospheric Flight Mechanics Conference and Exhibit

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A comparison of two methods to deal with allocating controls for unattainable moments in an aircraft was performed using a testbed airframe that resembled an F/A-18 with a large control effector suite. The method of preserving the desired moment direction to deal with unattainable moments is currently used in a specific control allocator. A new method of prioritizing the pitch axis is compared to the moment-direction preservation. Realtime piloted simulations are completed to evaluate the characteristics and performance of these methods.A direct comparison between the method of preserving the moment direction by scaling the control solution vector and prioritizing the pitching moment axis is performed for a specific case. Representative maneuvers are flown with a highly unstable airframe to evaluate the ability to achieve the specific task. Flight performance and pilot interpretation are used to evaluate the two methods.Pilot comments and performance results favored the method of pitch-axis prioritization. This method provided favorable flight characteristics compared to the alternative method of preserving the moment direction for the specific tasks detailed in this paper. AcknowledgmentsI would like to thank first and foremost my parents for their support and unending advice that have helped me to make the most of myself and live my life to the fullest. To my sister Julie and my brother Daniel with whom I have the fortune of knowing. Julie's pursuit to make the most of life in the face of constant hurdles, and Dan's quest to never be in the shadow of older siblings has made our relationships both exhaustive and rewarding.I would like to thank my advisor Dr. Wayne Durham for his persistence and patience with me and my academic career. He has given me the perfect work environment and has constantly pushed me, with much resistance, to achieve all that I could. To the remaining members of my commitee, Dr. Fred Lutze and Dr. Chris Hall, thank you for making my education at Virginia Tech a wonderful experience and for sharing everyday life experiences with me.

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Section: Naval Air Systems Command Provided the Original F/a-18 Simulmentioning

confidence: 99%

Comparison of Two Methods Used to Deal with Saturation of Multiple, Redundant Aircraft Control Effectors

Nelson

2002

AIAA Atmospheric Flight Mechanics Conference and Exhibit

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“…CASTLE is a flexible, user-friendly 6 degree of freedom nonlinear aircraft simulation package that was originally developed by the Naval Air Warfare Center's Manned Flight Simulator Branch (MFS). [12] The flight simulation laboratory at Virginia Polytechnic Institute and State University currently utilizes CASTLE in its modified 2F122A motion based simulator. [13] All simulations are run at a 100 Hz frame rate and data is recorded at 10 Hz unless otherwise stated.…”

Section: Simulation Code and Environmentmentioning

confidence: 99%

“…It is an ideal aircraft for the ACTIVE research role. 6,7,8,9,10,11,12,13,14,15,16,17,18,19 /* Control Names */ "DHTL", "DHTR", "DAILL", "DAILR", "DCANL", "DCANR", "DRUDL", "DRUDR", "DPVL", "DPVR", "DYVL", "DYVR", "DTFL", "DTFR"}; char *filename[] = { /* Filenames */ "dl.dat", "dm.dat", "dn.dat", "dy.dat", "dl_pa.dat", "dm_pa.dat", "dn_pa.dat", "dy_pa.dat"}; …”

Section: Aircraft Statisticsmentioning

confidence: 99%

A comparison of control allocation methods for the F-15 ACTIVE research aircraft utilizing real-time piloted simulations

Scalera

1999

Guidance, Navigation, and Control Conference and Exhibit

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A comparison of two control allocation methods is performed utilizing the F-15 ACTIVE research vehicle. The control allocator currently implemented on the aircraft is replaced in the simulation with a control allocator that accounts for both control effector positions and rates. Validation of the performance of this Moment Rate Allocation scheme through real-time piloted simulations is desired for an aircraft with a high fidelity control law and a larger control effector suite.A more computationally efficient search algorithm that alleviates the timing concerns associated with the early work in Direct Allocation is presented. This new search algorithm, deemed the Bisecting, Edge-Search Algorithm, utilizes concepts derived from pure geometry to efficiently determine the intersection of a line with a convex faceted surface.Control restoring methods, designed to drive control effectors towards a "desired" configuration with the control power that remains after the satisfaction of the desired moments, are discussed. Minimum-sideforce restoring is presented. In addition, the concept of variable step size restoring algorithms is introduced and shown to yield the best tradeoff between restoring convergence speed and control chatter reduction.Representative maneuvers are flown to evaluate the control allocator's ability to perform during realistic tasks. An investigation is performed into the capability of the control allocators to reconfigure the control effectors in the event of an identified control failure. More specifically, once the control allocator has been forced to reconfigure the controls, an investigation is undertaken into possible performance degradation to determine whether or not the aircraft will still demonstrate acceptable flying qualities.A direct comparison of the performance of each of the two control allocators in a reduced global position limits configuration is investigated. Due to the highly redundant control effector suite of the F-15 ACTIVE, the aircraft, utilizing Moment Rate Allocation, still exhibits satisfactory performance in this configuration. The ability of Moment Rate Allocation to utilize the full moment generating capabilities of a suite of controls is demonstrated. AcknowledgmentsI would like to extend my most sincere gratitude to my parents for their support and encouragement over the years. They have inspired me to make the most of myself and to live each day to the fullest. It is because of their guidance and direction that I find myself continously striving towards the top with aspirations of overcoming any obstacle along the way. To my brothers Steve and Jon between whom I have been fortunate enough to have grown up. With Steve's endless effort to lead the way, blazing new trails and setting benchmarks at each step, and with Jon's relentless desire to never stay in the shadow of Steve and I, it has thus far been an exhausting yet rewarding quest through academia and life.I must thank my advisor Dr. Wayne Durham for his persistence and patience with me.He took me under his win...

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Using Simulation to Optimize Ski Jump Ramp Profiles for STOVL Aircraft

Imhof

Schork

1999

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The platform-independent aircraft simulation environment at Manned Flight Simulator

Cited by 6 publications

References 2 publications

Comparison of Two Methods Used to Deal with Saturation of Multiple, Redundant Aircraft Control Effectors

Comparison of Two Methods Used to Deal with Saturation of Multiple, Redundant Aircraft Control Effectors

A comparison of control allocation methods for the F-15 ACTIVE research aircraft utilizing real-time piloted simulations

Using Simulation to Optimize Ski Jump Ramp Profiles for STOVL Aircraft

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